What is pUC19 plasmid?

What is pUC19 plasmid?

pUC19 is one of a series of plasmid cloning vectors created by Joachim Messing and co-workers. The designation “pUC” is derived from the classical “p” prefix (denoting “plasmid“) and the abbreviation for the University of California, where early work on the plasmid series had been conducted.

  • pUC19 is a commonly used cloning vector that conveys the Amp resistance.
  • The molecule is a small double-stranded circle, 2686 base pairs in length, and has a high copy number.
  • pUC19 carries a 54 base-pair multiple cloning site polylinkers that contain unique sites for 13 different hexanucleotide-specific restriction endonucleases (1).
  • NEB offers a selection of common cloning plasmids and DNAs for use as substrates.
Credit: Addgene

Thermo Scientific pUC19 vector


Thermo Scientific pUC19 vector is a small, high copy number, E. coli plasmid, 2686 bp in length. It contains identical multiple cloning site (MCS) as pUC18 vector except that it is arranged in opposite orientation.


• Purified by chromatography using proprietary patented technology
• More than 90% in the supercoiled form
• Isolated from E.coli (dam+, dcm+)
• For pUC18 DNA sequence, pUC19 DNA sequence, sequence analysis and map creation, see free online REviewer tool.


• Cloning
• Sequencing of insert DNA, pUC18 DNA: Preparation of DNA molecular weight standards

pUC18/19 plasmid contents and usage notes – pUC18/19 plasmids contain:
• The pMB1 replicon rep responsible for the replication of plasmid (source – plasmid pBR322). The high copy number of pUC plasmids is a result of the lack of the rop gene and a single point mutation in the replicon rep of pMB1.
• The bla gene, encoding beta-lactamase, confers resistance to ampicillin (source – plasmid pBR322). It differs from that of pBR322 by two point mutations
• The region of E.coli lac operon containing a CAP protein binding site, promoter Placlac repressor binding site and the 5’-terminal part of the lacZ gene encoding the N-terminal fragment of beta-galactosidase (source – M13mp18/19). This fragment, whose synthesis can be induced by IPTG, is capable of intra-allelic (alpha) complementation with a defective form of beta-galactosidase encoded by the host (mutation delta(lacZ)M15). In the presence of IPTG, bacteria synthesize both fragments of the enzyme and form blue colonies on media with X-Gal. Insertion of DNA into the MCS located within the lacZ gene (codons 6-7 of lacZ are replaced by MCS) inactivates the N-terminal fragment of beta-galactosidase and abolishes alpha-complementation. Bacteria carrying recombinant plasmids, therefore, give rise to white colonies

The map shows enzymes that cut pUC18 DNA once. Enzymes produced by Thermo Scientific are shown in orange. The coordinates refer to the position of the first nucleotide in each recognition sequence.

The exact positions of the genetic elements are shown on the map (termination codons included). The bla gene nucleotides 2486-2418 (complementary strand) code for a signal peptide. The LacZ polypeptide corresponding to wt beta-galactosidase and essential for blue/white screening ends at nt position 236 (compl. strand). Another 30 codons in the same reading frame are derived from pBR322. The indicated rep region is sufficient to promote replication. DNA replication initiates at position 866 (± 1) and proceeds in the direction indicated. Plasmids carrying the pMB1 and ColE1 replicons are incompatible, but they are fully compatible with those carrying the p15A replicon (pACYC177, pACYC184). pMB1-derived plasmids can be amplified using chloramphenicol.

Rajat Singhhttps://bioinformaticsindia.com
Rajat Singh is the chief Author at Bioinformatics India, he has been writing for the past 3 years and has a special interest in SEO, Technology, Health, Life Sciences and gaming.

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